So here is the base of it, I actually love the Vigilante. The talents are cool, and on top of that you can build a terrifying monster of a pc. Thinkin somewhere between Red Country's Lamb and Watchman's Rorschach
To start I want to go human Stalker Vigilante with Weapon Focus, Dazzling Display to do AOE scary, my char is an wounded worn out warrior who turns out to be a ruthless killer in his vigilante state and with the Twisting Fear talent i start doing AOE nonlethal scary.
From there I go Up Close and Personal, Leave an Opening, and Vital Punishment for talents and Gory Finish, Combat Expertise, Improved Dirty trick, and Cloak and Dagger style for feats.
My turns are basically, move to provoke an attack of opportunity jump out of the way, stab him (with vital strike hidden strike) and leave an opening to vital strike him during his turn with a bunch of dirty tricks thrown into the mix, aaaand when I kill guys the others freak out so much they fall unconscious.
end build is looking like this:
20 point buy
Str: 14 (12 +2)
Dex: 14
Con: 13
Int: 14
Wis: 10
Charisma: 14
feats/talents
1f Weapon focus shortsword (start with a gladious)
1f Dazzling Display
2t twisting Fear
3f Gory Finish
4t Up Close and Personal
5f Combat Expertise
6t Vital Strike
7f Improved Dirty trick
8t Leave an Opening
9f Cloak and Dagger Style
10t Perfect Vulnerability
11f Notorious Vigilante
12t Leathal Grace
13f Combat reflexes
14t Evasive
15f Cloak and Dagger Subterfuge